CN100467184C - Arc stud welding gun and the welding method thereof - Google Patents
Arc stud welding gun and the welding method thereof Download PDFInfo
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- CN100467184C CN100467184C CNB2007100177016A CN200710017701A CN100467184C CN 100467184 C CN100467184 C CN 100467184C CN B2007100177016 A CNB2007100177016 A CN B2007100177016A CN 200710017701 A CN200710017701 A CN 200710017701A CN 100467184 C CN100467184 C CN 100467184C
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Abstract
The present invention discloses one kind of stud welding gun with force measuring sensor and its welding process. During welding and after the stud moves to contact with the workpiece, the contact force is transmitted through the resistance strain gage in the pressure sensor, which is connected be the rotating mechanism of the welding gun and the stud fixture, to the data acquiring card of the control computer. After the detected contact force reaches the set value, the welding current to the stud fixture is turned on, the motion controller connected electrically to the motor makes the motor rotate reversely and the stud is raised for ignite electric arc. During welding feed, the welding current is first turned off, the motion controller drives the motor to rotate and the stud is fed to the workpiece; and after the detected feeding pressure of the stud to the workpiece reaches the set value, the motor is stopped.
Description
Technical field:
The present invention relates to arc stud welder and welding method, particularly a kind of arc stud welding gun and welding method thereof.
Background technology
Electric arc stud welding is a kind of efficient, high-quality stud welding method.The source of welding current, welding controller and arc stud welding gun are that a complete institute of electric arc stud welding system is prerequisite.Wherein arc stud welding gun is the direct executing agency of welding process, plays a part to regulate the part welding parameter, finish welding process, and the quality of welding gun performance has very big influence for welding quality.By continuous improvement and innovation, the arc stud soldering equipment also several times updates, and is also obtaining very big improvement aspect performance and the outward appearance.But the primary structure of welding gun has kept original design principle, and the electromagnetic type arc stud welding gun still is the main product during engineering is used, and the realization of its welding process mainly is by the compression of the power on/off of coil and spring and stretches and finish.In the welding operation process of reality, the motion of welding gun can be divided into: precompressed is sent, is promoted striking to, regularly keeps, cuts off the power supply and send four processes to.Be exactly that process is sent in the outage of double-screw bolt to wherein to welding quality influence maximum.In order to obtain good welding point, common stud welding gun all can sent the certain upset force of end reservation to, and promptly pushing inlet pressure gives the amount of establishing.The moulding of this strength butt welded seam and the influence of the institutional framework of weld seam are very big.The size of existing its pushing inlet pressure of arc stud welding gun adopts during by precompressed the decrement of spring to decide, and in the actual welding process setting of this value is relied on fully operator's experience.Serious or have at surface of the work under the situation of contour plate in double-screw bolt or surface of the work scaling loss, then may occur since the deficiency of precompressed amount setting cause down send the degree of depth inadequately, thereby the pushing inlet pressure that original expection is obtained reduces, and causes the reduction of weldquality.
Summary of the invention
The present invention is directed to existing stud welding gun double-screw bolt pushing inlet pressure in sending process to can not detect, and then cause the double-screw bolt uncontrollable defective of moving, the controlled welding method of a kind of pushing inlet pressure that a kind of stud welding gun of sensor dynamometry is provided and has adopted this welding gun can significantly improve the welding quality of arc stud welding.
For reaching above purpose, the present invention adopts following technical scheme to be achieved:
A kind of arc stud welding gun, comprise double-screw bolt anchor clamps, vertical installing plate, a motor is fixed on installing plate one side top, the middle part is provided with a rotating mechanism, this rotating mechanism is connected with the rotating shaft of motor, be provided with a straight-line motion mechanism between described rotating mechanism and the installing plate bottom, it is characterized in that, described rotating mechanism is connected with the double-screw bolt anchor clamps by a pressure sensor that is provided with resistance strain gage, described double-screw bolt anchor clamps and pressure sensor junction are provided with collets, and the pressure signal of described resistance strain gage exports the data acquisition unit of computer to; Described motor is electrically connected with a motion controller, and motion controller is connected with the motion control unit signal of master computer.
In the such scheme, described pressure sensor comprises a gland that is connected with rotating mechanism and screening can, be provided with a response body in the screening can, the upper end of response body is weldingly fixed on the gland, the lower end of response body is connected with the double-screw bolt anchor clamps by described collets, and resistance strain gage is installed in the upper and lower both sides of horizontal boom of response body and the position of close response body upper end and horizontal boom junction; This resistance strain gage is the Hui Sitong strain bridge.
A kind of welding method that adopts above-mentioned arc stud welding gun, comprise the step of following order: process is sent in precompressed to, promotes arc process, maintenance process regularly, process is sent in welding to; It is characterized in that, described precompressed is sent to and promotes in the arc process, when moving to workpiece, double-screw bolt contacts, contact force passes to data collecting card in the main control computer by the resistance strain gage in the pressure sensor, this pressure sensor is connected between the rotating mechanism and double-screw bolt anchor clamps of welding gun, when the contact force that detects double-screw bolt and workpiece when pressure sensor reaches predefined precompression, connect the welding current that connects the double-screw bolt anchor clamps, the motion controller reverse motors that is electrically connected with motor, and promote double-screw bolt according to the hoisting velocity that sets in advance and realize that electric arc ignites;
Described last welding is sent in the process, close welding current earlier, the motion controller drive motors rotates, make double-screw bolt make feed motion to workpiece by certain feed rate, the process basically identical is sent in its motion control process and described precompressed to, when the pushing inlet pressure that detects double-screw bolt and workpiece when pressure sensor is predefined welding upset force, stops motor and rotate.
In the technique scheme, described welding send in the process feed rate be 23 mm/second; The welding upset force is redefined for 60 newton.
Compare with conventional arc arc stud welding, welding gun of the present invention is an accurately controlled linear motion platform of a displacement, between welding gun rotating mechanism and double-screw bolt anchor clamps, be provided with a special-purpose pushing inlet pressure sensor of design voluntarily, be used for double-screw bolt and send the real-time detection of pressure changing between stage double-screw bolt and the workpiece to, its pressure signal is handled by the master computer data of welding system, determine to send to process and whether reached predefined value, motion control unit by the welding system master computer provides control signal and exports motion controller to the control motor again, realized the controlled of double-screw bolt motion, guarantee after end is sent in welding to double-screw bolt to be applied certain upset force, thereby obtain good welding point, improve welding quality.
Description of drawings
Fig. 1 is the structural representation of stud welding gun of the present invention.
Fig. 2 is the side view of Fig. 1.
Among Fig. 1 and Fig. 2, the 1-installing plate; The 2-motor; The 3-shaft joint; The 4-bearing; The 5-leading screw; The 6-feed screw nut; The 7-connector; The 8-pressure sensor; The 9-collets; 10-double-screw bolt anchor clamps; The 11-electric machine support; The 12-straight-line motion mechanism.
Fig. 3 is the pressure sensor profile among Fig. 1.Wherein: the 20-gland; The 21-shell; The 22-connector; The 23-resistance strain gage; The 24-response body; 25 horizontal boom.
Fig. 4 is the welding system block diagram that adopts feeding method of the present invention.
Fig. 5 is that the pushing inlet pressure of two kinds of welding processes changes comparison diagram.Wherein, Fig. 5 a is the welding process under the constant situation of traditional welding gun pressure preset value; Fig. 5 b is the welding process under the controlled situation of pushing inlet pressure of the present invention.
Fig. 6 is the mass effect figure of two kinds of stud welding processes.Wherein Fig. 6 a is the welding effect figure under the constant situation of traditional welding gun pressure preset value; Fig. 6 b is the welding effect figure under the controlled situation of pushing inlet pressure of the present invention.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
As shown in Figure 1 and Figure 2, a kind of arc stud welding gun, comprise double-screw bolt anchor clamps 10 (arc welding electrode), vertical installing plate 1, a motor 2 is fixed by support 11 in the one side top of installing plate 1, the middle part is provided with ball screw assembly,, promptly bearing 4, leading screw 5 and with the feed screw nut 6 of its threaded engagement, leading screw 5 is connected with the rotating shaft of motor 2 by a shaft coupling 3, be provided with a straight-line motion mechanism 12 between ball screw assembly, and installing plate 1 bottom, this straight-line motion mechanism 12 can be a guide rail.Feed screw nut 6 and a connector 7 are fixing, and are connected with double-screw bolt anchor clamps 10 by a pressure sensor 8, and double-screw bolt anchor clamps 10 are provided with collets 9 with pressure sensor 8 junctions.The motion of stud welding gun is realized by installing plate 1, motor 2, ball screw assembly, and rectilinear motion unit 12, they have constituted accurately controlled linear motion platform of a displacement, are used for the control signal (driving of motor can realize by the motion controller that is connected with the motion control unit signal of master computer) of responsive computer.
Pressure between double-screw bolt and the workpiece is passed to pressure sensor 8 by double-screw bolt anchor clamps 10, realizes the real-time monitoring to pressure.The effect of collets 9 has two: one is the influence of heavy current when preventing that motor 2 on the rectilinear motion unit 12 from being welded, and another is to prevent that the sensing element in the pressure sensor 8 from being welded the influence of heavy current.
As shown in Figure 3, pressure sensor 8 comprises a gland 20 that is connected with connector 7 and screening can 21, a response body 24 is set in the screening can 21, the upper end of response body 24 is weldingly fixed on the gland 20, the lower end of response body 24 is connected with described collets 9 and double-screw bolt anchor clamps 10 by a connector 22, resistance strain gage 23 is installed in the upper and lower both sides of response body 24 horizontal boom 25, and near response body 24 upper ends and position, horizontal boom 25 junction, because the strain effect of horizontal boom 25 after this position is stressed is the most responsive.So it is best that resistance strain gage 23 is arranged on this position effect, resistance strain gage 23 can adopt the Hui Sitong strain bridge, by the power supply of 5VDC constant voltage, bridge circuit impedance: 120 Ω; Bridge circuit form: Hui Sitong full-bridge.This strain bridge can capture the faint deformation of horizontal boom 25, and detected signal is exported to the data acquisition unit of master computer.Output cable length is 2m four-core shielded cable; Output signal: cooperating the transmitter that matches is 0～5V; Synthesis precision: 0.04%FS; Duplicate measurements error: 0.04%FS; Output at zero point: 3%FS; Sensitivity: 1.3mV/V; Overload capacity: 130%FS.Screening can 2 adopts metal material to make, and its small-signal that foil gauge 23 is produced is avoided outside strong weld current interference.
The horizontal boom structure of the foil gauge 23 of pressure sensor 8, can make the pressure variation that double-screw bolt contacts with workpiece that captures of Hui Sitong strain bridge energy sensitivity, send the kinetic control system of motor to by computer system, thereby solved the last controlled technical problem of the upsetting force of sending step to that influences welding quality, simultaneously, the sensor of this special construction, dynamometry precision are also very high.Response body 24 can adopt TC4 titanium alloy line cutting processing to reduce machining stress.
As shown in Figure 4, corollary equipment of the present invention is made up of universal host computer and programming system two parts.Programming system is made up of man-machine interaction program, motion control program and data processor.During welding operation, the operator at first calculates the experiment parameter such as the parameters such as welding gun hoisting depth, hoisting velocity of welding gun motion by master control human-computer interaction device's input, the data computation memory device of master computer, export control signal according to the welding gun pressure sensor state that the parameter that obtains and data collecting card collect by motion control unit, the rotating speed of control stud welding gun motor 2, and then the motion of control double-screw bolt, finish the whole process of stud welding.
The welding method of above-mentioned arc stud welding gun specifically comprises the steps:
(1) process is sent in precompressed to, at first send instruction to motion controller by the control module of main control computer, thereby 2 rotations of motion controller control motor drive leading screw-nut kinematic pair 5,6 and pressure sensor 8 rectilinear motions, make the double-screw bolt anchor clamps 10 that are connected with sensor 8 drive double-screw bolt and move to surface of the work.Simultaneously, the signal of the continuous detected pressures sensor 8 of the meeting of the data collecting card in the main control computer.Double-screw bolt does not contact with workpiece at the beginning, and sensor 8 and no signal output contacts when double-screw bolt moves to workpiece, and the structure that is rigidly connected that contact force is constituted by double-screw bolt anchor clamps 10, collets 9, connector 22 passes on the interior response body 24 of sensor 8.The cantilever 25 of response body 24 produces strain under the effect of pressure, make the resistance strain gage 23 on it produce signals output, and the data collecting card in the main control computer is judged the situation that contacts of double-screw bolt and workpiece by the size that detects this signal.Along with the increase of sending displacement to, the power of sending to also increases thereupon, and the process end is sent in precompressed to when reaching the precompression that expectation in advance obtains, and the pressure when precompression can be set at double-screw bolt and closely contacts with workpiece gets final product.
(2) promote arc process, connect the welding current that connects double-screw bolt anchor clamps 10, reverse motors 2 also promotes double-screw bolt according to 20 mm/second hoisting velocities and realizes that electric arc ignites.
(3) timing maintenance process when double-screw bolt is thus lifted to setting height, during as 4 millimeters, stops motor 2 rotations and stable welding current and forms certain molten bath.Because double-screw bolt does not contact with workpiece, and strain transducer body 24 does not have stressed, so acquisition system detects and to be pressure-less state in this process, and the timing retention time is 1200 milliseconds.
(4) process is sent in welding to, closes welding current, and what reverse motors 2 realized double-screw bolts once more send motion down, and feed rate is 23 mm/second, sends upset force to and is redefined for 60 newton.When pressure sensor 8 detected this upset force, motion controller stopped motor 2 and rotates, and the whole process of sending to is realized by 2 rotations of computer motion module control motor.
The welding effect of the above embodiment of the present invention can be referring to Fig. 6 b.
Fig. 5 and Fig. 6 show the present invention and traditional welding process pushing inlet pressure to actual welding effect contrast when.Fig. 5 a is a contact force situation of change between welding gun double-screw bolt end face and the workpiece in the welding process under the constant situation of preset pressure value.From Fig. 5 a, can see, between welding process incipient stage double-screw bolt termination and workpiece, have certain precompression, the tight contact when guaranteeing striking between the two, simultaneously for common stud welding, this power also is the source that double-screw bolt is sent pushing inlet pressure in the process to; Next be that the double-screw bolt motion stops to weld the maintenance stage this stage electric arc sustained combustion; Be that the stage is sent in arc stud welding at last, along with double-screw bolt is constantly sent to, the pressure between termination and the workpiece is also in continuous increase.Common arc stud welding does not possess the detection control device of this power, the distance of sending to is that the spring precompressed value by initial setting realizes, therefore, this pressure size and send distance to and can not automatically judge and adjust in the process of welding, to diameter 16mm stud welding the time, can't form reliable joint because the power of sending to is not enough, so welding effect is relatively poor (sees Fig. 6 a).Fig. 5 b is for adopting the control principle of stud welding gun of the present invention and welding method, the variation that detects this pressure by homemade pressure sensor 8 judges double-screw bolt sends whether the double-screw bolt termination closely contacts with workpiece in the process to exactly, whether the size that is pressure has reached setting value, controls the feed motion of double-screw bolt by this power.Setting value choose the effective evaluation that then derives from actual welding.Can find out that from the figure of Fig. 5 b when pressure reaches preset value, as 60 newton of above-mentioned embodiment, welding gun will respond rapidly and stop to send to.Can see from Fig. 6 b, to diameter 16mm stud welding the time, by the quality of welding point obviously being improved to sending progressively increasing of power to,
Claims (6)
1. arc stud welding gun, comprise double-screw bolt anchor clamps, vertical installing plate, a motor is fixed on installing plate one side top, the middle part is provided with a rotating mechanism, this rotating mechanism is connected with the rotating shaft of motor, be provided with a straight-line motion mechanism between described rotating mechanism and the installing plate bottom, it is characterized in that, described rotating mechanism is connected with the double-screw bolt anchor clamps by a pressure sensor that is provided with resistance strain gage, described double-screw bolt anchor clamps and pressure sensor junction are provided with collets, and the pressure signal of described resistance strain gage exports the data acquisition unit of computer to; Described motor is connected with a motion controller, and motion controller is connected with the motion control unit signal of master computer.
2. arc stud welding gun according to claim 1, it is characterized in that, described pressure sensor comprises a gland that is connected with rotating mechanism and screening can, be provided with a response body in the screening can, the upper end of response body is weldingly fixed on the gland, the lower end of response body is connected with the double-screw bolt anchor clamps by described collets, and resistance strain gage is installed in the upper and lower both sides of horizontal boom of response body and the position of close response body upper end and horizontal boom junction.
3. arc stud welding gun according to claim 1 and 2 is characterized in that, described resistance strain gage is the Hui Sitong strain bridge.
4. the welding method of the described arc stud welding gun of claim 1, comprise the step of following order: process is sent in precompressed to, promotes arc process, maintenance process regularly, process is sent in welding to; It is characterized in that, described precompressed is sent to and promotes in the arc process, contact when double-screw bolt moves to workpiece, contact force passes to data collecting card in the main control computer by the resistance strain gage in the described pressure sensor, and this pressure sensor is connected between the rotating mechanism and double-screw bolt anchor clamps of welding gun; When the contact force that detects double-screw bolt and workpiece when pressure sensor reaches predefined precompression, connect the welding current that connects the double-screw bolt anchor clamps, the motion controller reverse motors that is electrically connected with motor, and promote double-screw bolt according to the hoisting velocity that sets in advance and realize that electric arc ignites;
Last described welding is sent in the process, close welding current earlier, the motion controller drive motors rotates, and makes double-screw bolt make feed motion by certain feed rate to workpiece, when the pushing inlet pressure that detects double-screw bolt and workpiece when pressure sensor is predefined welding upset force, stops motor and rotate.
5. according to the welding method of the described arc stud welding gun of claim 4, it is characterized in that the feed rate that described welding is sent in the process is 23 mm/second.
6. according to the welding method of claim 4 or 5 described arc stud welding guns, it is characterized in that the welding upset force that described welding is sent in the process is redefined for 60 newton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100177016A CN100467184C (en) | 2007-04-18 | 2007-04-18 | Arc stud welding gun and the welding method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100177016A CN100467184C (en) | 2007-04-18 | 2007-04-18 | Arc stud welding gun and the welding method thereof |
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| CN101032779A CN101032779A (en) | 2007-09-12 |
| CN100467184C true CN100467184C (en) | 2009-03-11 |
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| CNB2007100177016A Expired - Fee Related CN100467184C (en) | 2007-04-18 | 2007-04-18 | Arc stud welding gun and the welding method thereof |
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| DE102008044451B4 (en) * | 2008-08-19 | 2012-09-06 | Thyssenkrupp Steel Europe Ag | Conductive stud welding |
| CN102114567B (en) * | 2009-12-31 | 2013-06-05 | 南京理工大学 | Robotic automatic large-diameter stud welding gun |
| DE102010013913B4 (en) | 2010-04-01 | 2012-01-12 | Newfrey Llc | Joining method and joining device |
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| CN105328313B (en) * | 2015-11-13 | 2017-04-19 | 江苏绿叶锅炉有限公司 | Electric-arc welding gun for V-shaped nails |
| CN106289608B (en) * | 2016-08-02 | 2018-11-13 | 北京航空航天大学 | A kind of device and method measuring welding arc axial force |
| DE102016117177A1 (en) * | 2016-09-13 | 2018-03-15 | Newfrey Llc | Method and device for joining a joining element on a workpiece |
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| EP3466582A1 (en) * | 2017-10-06 | 2019-04-10 | HILTI Aktiengesellschaft | Stud welding device and method |
| EP3466587A1 (en) * | 2017-10-06 | 2019-04-10 | HILTI Aktiengesellschaft | Stud welding device and method |
| EP3492207A1 (en) | 2017-12-04 | 2019-06-05 | HILTI Aktiengesellschaft | Stud welding device and method |
| CN110816231A (en) * | 2019-11-04 | 2020-02-21 | 一汽轿车股份有限公司 | Device for identifying whether hinge nut plate of inner plate of back door of automobile is neglected to be installed or not |
| WO2021182243A1 (en) * | 2020-03-10 | 2021-09-16 | ファナック株式会社 | Robot control device |
| JP7548131B2 (en) * | 2021-06-15 | 2024-09-10 | トヨタ自動車株式会社 | Arc stud welding method and arc stud welding device |
| CN115156670B (en) * | 2022-07-01 | 2023-08-04 | 浙江上势自动焊接科技有限公司 | Wireless control method of stud welding equipment |
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Assignee: Dongguan Changjiang Computer Product Co., Ltd. Assignor: Xi'an Jiaotong University Contract record no.: 2010440000458 Denomination of invention: Arc stud welding gun and the welding method thereof Granted publication date: 20090311 License type: Exclusive License Open date: 20070912 Record date: 20100505 |
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